How can we add a key:value pair at a specific position in an array in Angular 2 using Typescript?

Is there a way to insert a key value pair at a specific index in an array? I am currently struggling with this task.

Here is the code I have been working on:

  this.quiz.push(
{
  "question-no":this.no,
  "Ans":this.ans
}

I require this functionality to store the user's selected choice for each question in the array. If the user decides to change their selection, I want to replace it within the same position in the array. However, it seems that a new element is being created instead of replacing the existing one. I am unsure how to go about inserting the key value pair at a particular index. Can someone provide assistance?

Thank you in advance.

arraysobjecttypescriptkey-valueangular2-directives

Answer №1

If you want to add an item at a specific index, make sure to use the splice function.

this.data.splice(indexToAdd, 0, newElement);

Hopefully this information is useful for you!

Answer №2

To easily swap out the current element at a specific position:

this.test[index] = {
  "Q-no":this.number,
  "Response":this.response
};

For example:

this.test[7] = {
  "Q-no":this.number,
  "Response":this.response
};

Keep in mind that whatever was previously stored at position 7 will be overwritten.

Answer №3

experiment with adding arr.splice(index, 0, item); to the designated index. This will insert an item without deleting anything.

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